Turn off wireless for 2.4Ghz?

I have an N600 which allows a wireless connection of 2.4 & 5.0 GHhz.

Is it possible to turn off the wireless transmission of the 2.4Ghz?

I find I only have a need to connect via the 5Ghz and see the 2.4Ghz side as an uneccessary clutter of the airwaves + an unneedded, potential security hole for my network.